Binder layout is broken and unable to fix, please help me.

Hi there, this is the first time for me to ask something here, I’m so nervous but let me keep going.
I’m a Japanese and using Scrivener 3 , Japanese translated version. One day when I open my project, without doing anything, my binder was like this.

I’ve tried to fix this so hard, I uninstall the app and re-install it, but still this blank remains…
Can anybody give me a solution for this problem? I’d appreciate it if you do. Thanks.


Thank you so much for the answer! It’s working now!!